There are many social media groups interested in vegan media and content for activism. The best collective I have found would probably be the subreddit called r/veganactivism. Here is a partner website that discusses the use of the subreddit
On the website there is the following claim:
… the most comprehensive verified list of Vegan Activism organizations online for Vegans looking to jump into activism. Whether you have a lot of time or little, whether you're new or experienced, there's an organization here that's looking for your help to spread our compassionate vegan message.
The subreddit and associated website don't necessarily accommodate your request for generalised material, but they are a start. You can direct a request to them if you need better content. Or, post to the subreddit asking for alternative material. Maybe even ask for volunteers willing to produce content.
Another option is the poorly tended Wikipedia list for vegan media. It doesn't offer a lot for activists, but it is an intended repository to identify information sources.